Abstract
AbstractIn rock formations prone to karstification, there are no or only limited geological/hydrological principles that enable safe prognosis of the existence and location of karst and fault structures. The application of geophysical methods offers a high efficiency of detection and localisation of faults, cavities and karst structures, and when combined with targeted verification drillings, provides an extensive three‐dimensional structural investigation of rock formations. Four examples of geophysical karst and fault investigations in German tunnelling are presented here to demonstrate the innovative technologies and their respective survey results that in all cases contributed to a safe excavation process and later operation of the tunnels.
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